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- .\" -*- mode: troff; coding: utf-8 -*-
- .\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43)
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- .\"
- .IX Title "DSA_DUP_DH 3ossl"
- .TH DSA_DUP_DH 3ossl 2025-01-17 3.4.0 OpenSSL
- .\" For nroff, turn off justification. Always turn off hyphenation; it makes
- .\" way too many mistakes in technical documents.
- .if n .ad l
- .nh
- .SH NAME
- DSA_dup_DH \- create a DH structure out of DSA structure
- .SH SYNOPSIS
- .IX Header "SYNOPSIS"
- .Vb 1
- \& #include <openssl/dsa.h>
- .Ve
- .PP
- The following functions have been deprecated since OpenSSL 3.0, and can be
- hidden entirely by defining \fBOPENSSL_API_COMPAT\fR with a suitable version value,
- see \fBopenssl_user_macros\fR\|(7):
- .PP
- .Vb 1
- \& DH *DSA_dup_DH(const DSA *r);
- .Ve
- .SH DESCRIPTION
- .IX Header "DESCRIPTION"
- The function described on this page is deprecated. There is no direct
- replacement, applications should use the EVP_PKEY APIs for Diffie-Hellman
- operations.
- .PP
- \&\fBDSA_dup_DH()\fR duplicates DSA parameters/keys as DH parameters/keys. q
- is lost during that conversion, but the resulting DH parameters
- contain its length.
- .SH "RETURN VALUES"
- .IX Header "RETURN VALUES"
- \&\fBDSA_dup_DH()\fR returns the new \fBDH\fR structure, and NULL on error. The
- error codes can be obtained by \fBERR_get_error\fR\|(3).
- .SH NOTE
- .IX Header "NOTE"
- Be careful to avoid small subgroup attacks when using this.
- .SH "SEE ALSO"
- .IX Header "SEE ALSO"
- \&\fBDH_new\fR\|(3), \fBDSA_new\fR\|(3), \fBERR_get_error\fR\|(3)
- .SH HISTORY
- .IX Header "HISTORY"
- This function was deprecated in OpenSSL 3.0.
- .SH COPYRIGHT
- .IX Header "COPYRIGHT"
- Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved.
- .PP
- Licensed under the Apache License 2.0 (the "License"). You may not use
- this file except in compliance with the License. You can obtain a copy
- in the file LICENSE in the source distribution or at
- <https://www.openssl.org/source/license.html>.
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